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RESTON, VA, February 5, 2010 – comScore, Inc. (NASDAQ: SCOR), a leader in measuring the digital world, today released December 2009 data from the comScore Video Metrix service, showing that nearly 178 million U.S. Internet users watched online video during the month. Online video viewing continued to reach record levels in December, with 33.2 billion videos viewed during the month.

Top 10 Video Content Properties by Videos Viewed

Google Sites continued to rank as the top U.S. video property in December, delivering 13.2 billion videos, with YouTube.com accounting for nearly 99 percent of all videos viewed at the property. Hulu ranked second with more than 1 billion videos viewed, an all-time high for the property, and representing 3.0 percent market share. Microsoft Sites ranked third with 561 million (1.7 percent), followed by Fox Interactive Media with 551 million (1.7 percent) and Yahoo! Sites with 539 million (1.6 percent).

Nearly 178 million viewers watched an average of 187 videos per viewer during the month of December. Google Sites attracted 135.8 million unique viewers during the month (97.5 videos per viewer), followed by Yahoo! Sites with 59.8 million viewers (9.0 videos per viewer) and Fox Interactive Media with 56.8 million viewers (9.7 videos per viewer). The average Hulu viewer watched 22.9 videos during the month, representing another all-time high for the property.

In December, Tremor Media ranked as the top video ad network with a potential reach of 103.7 million viewers, or 58.3 percent of the total viewing audience. Advertising.com Video Network ranked second with 83.6 million viewers (47.0 percent), followed by SpotXchange Video Ad Network with 81.3 million viewers (45.7 percent)

About comScorecomScore, Inc. (NASDAQ: SCOR) is a global leader in measuring the digital world and preferred source of digital marketing intelligence. For more information, please visit www.comscore.com/companyinfo.